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| All Patents in class 403/27 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,975,215 | Oct. 02, 1934 | U.G. Thomas | Tool Holder | drilling and boring tool holders | |
| 5,487,315 | Jan. 30, 1996 | E. Kirkham, P.J. Finet | Rotational Motion Limit Detector System and Method | metalworking machine mechanisms | |